package cc.unitmesh.agent.mcp

import kotlinx.cinterop.*
import kotlinx.serialization.json.*
import kotlinx.serialization.encodeToString
import kotlinx.serialization.builtins.ListSerializer
import platform.Foundation.*
import kotlin.coroutines.resume
import kotlin.coroutines.resumeWithException
import kotlin.coroutines.suspendCoroutine

/**
 * iOS implementation of McpClientManager using Swift MCP SDK
 *
 * This implementation uses a Swift bridge layer (McpClientBridge) to interact
 * with the official Swift MCP SDK from https://github.com/modelcontextprotocol/swift-sdk
 *
 * Architecture:
 * Kotlin (this file) -> Swift Bridge (McpClientBridge.swift) -> Swift MCP SDK
 */
actual class McpClientManager {
    private var currentConfig: McpConfig? = null
    private val json = Json {
        prettyPrint = true
        ignoreUnknownKeys = true
    }

    // Note: Swift bridge instance would be created here
    // For now, this is a placeholder until we set up proper Swift interop

    actual suspend fun initialize(config: McpConfig) {
        currentConfig = config

        // Convert config to JSON for Swift bridge
        val configJson = json.encodeToString(config)

        // TODO: Call Swift bridge
        // bridge.initialize(configJson)

        println("McpClientManager.initialize() - iOS implementation with Swift MCP SDK")
    }

    actual suspend fun discoverAllTools(): Map<String, List<McpToolInfo>> {
        val config = currentConfig ?: return emptyMap()

        // Convert config to JSON for Swift bridge
        val configJson = json.encodeToString(config)

        // TODO: Call Swift bridge and parse result
        // val resultJson = bridge.discoverAllTools(configJson)
        // return parseToolsResult(resultJson)

        println("McpClientManager.discoverAllTools() - iOS implementation with Swift MCP SDK")
        return emptyMap()
    }

    actual suspend fun discoverServerTools(serverName: String): List<McpToolInfo> {
        val config = currentConfig ?: return emptyList()
        val serverConfig = config.mcpServers[serverName] ?: return emptyList()

        if (serverConfig.disabled) {
            return emptyList()
        }

        // Convert server config to JSON for Swift bridge
        val serverConfigJson = json.encodeToString(serverConfig)

        // TODO: Call Swift bridge and parse result
        // val resultJson = bridge.discoverServerTools(serverName, serverConfigJson)
        // return parseToolsList(resultJson)

        println("McpClientManager.discoverServerTools($serverName) - iOS implementation with Swift MCP SDK")
        return emptyList()
    }

    actual fun getServerStatus(serverName: String): McpServerStatus {
        // TODO: Call Swift bridge
        // val statusString = bridge.getServerStatus(serverName)
        // return parseServerStatus(statusString)

        return McpServerStatus.DISCONNECTED
    }

    actual fun getAllServerStatuses(): Map<String, McpServerStatus> {
        // TODO: Call Swift bridge and parse result
        // val statusesJson = bridge.getAllServerStatuses()
        // return parseServerStatuses(statusesJson)

        return emptyMap()
    }

    actual suspend fun executeTool(
        serverName: String,
        toolName: String,
        arguments: String
    ): String {
        // TODO: Call Swift bridge
        // return bridge.executeTool(serverName, toolName, arguments)

        println("McpClientManager.executeTool($serverName, $toolName) - iOS implementation with Swift MCP SDK")
        throw UnsupportedOperationException("MCP tool execution requires Swift bridge setup")
    }

    actual suspend fun shutdown() {
        // TODO: Call Swift bridge
        // bridge.shutdown()

        println("McpClientManager.shutdown() - iOS implementation with Swift MCP SDK")
    }

    actual fun getDiscoveryState(): McpDiscoveryState {
        // TODO: Call Swift bridge
        // val stateString = bridge.getDiscoveryState()
        // return parseDiscoveryState(stateString)

        return McpDiscoveryState.NOT_STARTED
    }

    // MARK: - Helper methods for parsing Swift bridge results

    private fun parseToolsResult(jsonString: String): Map<String, List<McpToolInfo>> {
        return try {
            val jsonElement = json.parseToJsonElement(jsonString)
            val result = mutableMapOf<String, List<McpToolInfo>>()

            jsonElement.jsonObject.forEach { (serverName, toolsArray) ->
                val tools = mutableListOf<McpToolInfo>()
                // toolsArray should be a JSON array
                if (toolsArray is kotlinx.serialization.json.JsonArray) {
                    toolsArray.forEach { toolElement ->
                        val tool = json.decodeFromJsonElement(McpToolInfo.serializer(), toolElement)
                        tools.add(tool)
                    }
                }
                result[serverName] = tools
            }

            result
        } catch (e: Exception) {
            println("Error parsing tools result: ${e.message}")
            emptyMap()
        }
    }

    private fun parseToolsList(jsonString: String): List<McpToolInfo> {
        return try {
            json.decodeFromString(
                kotlinx.serialization.builtins.ListSerializer(McpToolInfo.serializer()),
                jsonString
            )
        } catch (e: Exception) {
            println("Error parsing tools list: ${e.message}")
            emptyList()
        }
    }

    private fun parseServerStatus(statusString: String): McpServerStatus {
        return when (statusString) {
            "CONNECTED" -> McpServerStatus.CONNECTED
            "CONNECTING" -> McpServerStatus.CONNECTING
            "DISCONNECTING" -> McpServerStatus.DISCONNECTING
            else -> McpServerStatus.DISCONNECTED
        }
    }

    private fun parseServerStatuses(jsonString: String): Map<String, McpServerStatus> {
        return try {
            val jsonElement = json.parseToJsonElement(jsonString)
            val result = mutableMapOf<String, McpServerStatus>()

            jsonElement.jsonObject.forEach { (serverName, statusValue) ->
                val status = parseServerStatus(statusValue.jsonPrimitive.content)
                result[serverName] = status
            }

            result
        } catch (e: Exception) {
            println("Error parsing server statuses: ${e.message}")
            emptyMap()
        }
    }

    private fun parseDiscoveryState(stateString: String): McpDiscoveryState {
        return when (stateString) {
            "IN_PROGRESS" -> McpDiscoveryState.IN_PROGRESS
            "COMPLETED" -> McpDiscoveryState.COMPLETED
            else -> McpDiscoveryState.NOT_STARTED
        }
    }
}

actual object McpClientManagerFactory {
    actual fun create(): McpClientManager {
        return McpClientManager()
    }
}

